ak4538 AKM Semiconductor, Inc., ak4538 Datasheet - Page 35

• Manufacturer Part Number: ak4538
• Description: 16bit ?? Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Note)
1.
2.
3.
n MONO OUTPUT (MOUT2 pin)
The mixed Lch/Rch signal of DAC is output from the MOUT2 pin. When the MOUT2 bit is “0”, this output is OFF and the
MOUT2 pin is forced to VCOM voltage. The load impedance is 10k (min.). When the PMSPK bit is “0”, the
Speaker-amp enters power-down-mode and the output is placed in a Hi-Z state.
MS0198-E-01
(2) Using BEEPL and BEEPR pins
MOUT2 output is recommended to be AC coupled to avoid amplified DC offset of common voltage of MOUT2 and
BEEP-Amp is output via BTL Speaker-Amp (that means stand-by current is increased). Capacitor size affects the
cut-off frequency of 1
BEEP input path has 1.9dB greater gain than MIN input since ALC2 circuit is not included in BEEP path.
Internal feedback resister of BEEP-Amp which determines BEEP-Amp gain has 30% sample variation.
MOUT2
AK4538
Figure 30. Connection example for 300mW output using BEEPL and BEEPR pins
0.1u
st
order LPF made by this AC coupling capacitor and series resister in front of BEEP input.
15k
15k
BEEPL
BEEPR
45%AVDD
45%AVDD
- 35 -
20k
20k
30%
30%
BPSSP
BPSSP
SPK-Amp
SPP
SPN
[AK4538]
2003/5